Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Probing the CP nature of the Higgs coupling in tt¯h events at the LHC

Amor Dos Santos, S P ; Fiolhais, M. C.N. ; Frederix, R. LU orcid ; Gonçalo, R. ; Gouveia, E. ; Martins, R. ; Onofre, A. ; Pease, C. M. ; Peixoto, H. and Reigoto, A. , et al. (2017) In Physical Review D 96(1).
Abstract

The determination of the CP nature of the Higgs coupling to top quarks is addressed in this paper, using tt-h events produced in s=13 TeV proton-proton collisions at the LHC. Dileptonic final states are employed, with two oppositely charged leptons and four jets, corresponding to the decays t→bW+→b+ν, t-→b-W-→b--ν-, and h→bb-. Pure scalar (h=H), pure pseudoscalar (h=A), and CP-violating Higgs boson signal events, generated with MadGraph5-aMC@NLO, are fully reconstructed through a kinematic fit. We furthermore generate samples that have both a CP-even and a CP-odd component in the tt-h coupling in order to probe the ratio of the two components. New angular distributions of the decay products, as well as CP angular asymmetries, are... (More)

The determination of the CP nature of the Higgs coupling to top quarks is addressed in this paper, using tt-h events produced in s=13 TeV proton-proton collisions at the LHC. Dileptonic final states are employed, with two oppositely charged leptons and four jets, corresponding to the decays t→bW+→b+ν, t-→b-W-→b--ν-, and h→bb-. Pure scalar (h=H), pure pseudoscalar (h=A), and CP-violating Higgs boson signal events, generated with MadGraph5-aMC@NLO, are fully reconstructed through a kinematic fit. We furthermore generate samples that have both a CP-even and a CP-odd component in the tt-h coupling in order to probe the ratio of the two components. New angular distributions of the decay products, as well as CP angular asymmetries, are explored in order to separate the scalar from the pseudoscalar components of the Higgs boson and reduce the contribution from the dominant irreducible background, tt-bb. Significant differences between the angular distributions and asymmetries are observed, even after the full kinematic fit reconstruction of the events, allowing to define the best observables for a global fit of the Higgs couplings parameters.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; ; ; and , et al. (More)
; ; ; ; ; ; ; ; ; ; and (Less)
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review D
volume
96
issue
1
article number
013004
publisher
American Physical Society
external identifiers
  • scopus:85027047714
ISSN
2470-0010
DOI
10.1103/PhysRevD.96.013004
language
English
LU publication?
no
id
53c9971e-d4f2-42c2-addf-c5d50838c19e
alternative location
https://arxiv.org/pdf/1704.03565.pdf
date added to LUP
2019-05-28 15:52:26
date last changed
2022-04-26 00:52:56
@article{53c9971e-d4f2-42c2-addf-c5d50838c19e,
  abstract     = {{<p>The determination of the CP nature of the Higgs coupling to top quarks is addressed in this paper, using tt-h events produced in s=13 TeV proton-proton collisions at the LHC. Dileptonic final states are employed, with two oppositely charged leptons and four jets, corresponding to the decays t→bW+→b+ν, t-→b-W-→b--ν-, and h→bb-. Pure scalar (h=H), pure pseudoscalar (h=A), and CP-violating Higgs boson signal events, generated with MadGraph5-aMC@NLO, are fully reconstructed through a kinematic fit. We furthermore generate samples that have both a CP-even and a CP-odd component in the tt-h coupling in order to probe the ratio of the two components. New angular distributions of the decay products, as well as CP angular asymmetries, are explored in order to separate the scalar from the pseudoscalar components of the Higgs boson and reduce the contribution from the dominant irreducible background, tt-bb. Significant differences between the angular distributions and asymmetries are observed, even after the full kinematic fit reconstruction of the events, allowing to define the best observables for a global fit of the Higgs couplings parameters.</p>}},
  author       = {{Amor Dos Santos, S P and Fiolhais, M. C.N. and Frederix, R. and Gonçalo, R. and Gouveia, E. and Martins, R. and Onofre, A. and Pease, C. M. and Peixoto, H. and Reigoto, A. and Santos, R. and Silva, J.}},
  issn         = {{2470-0010}},
  language     = {{eng}},
  month        = {{07}},
  number       = {{1}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review D}},
  title        = {{Probing the CP nature of the Higgs coupling in tt¯h events at the LHC}},
  url          = {{http://dx.doi.org/10.1103/PhysRevD.96.013004}},
  doi          = {{10.1103/PhysRevD.96.013004}},
  volume       = {{96}},
  year         = {{2017}},
}